dumais



2 SheetsSheet 1.-

(No Model.)

J. B. Z. DUMAIS. PIPE THREADING MACHINE.

No. 477,406. v Patented June 21, 1892.

(No Model.) 2 Sheets-Sheet 2. J. B. Z. DUMAIS. PIPE 'THRBADING- MACHINE.

No. 477,406. Patented June 21, 1892.

.2 a 52L I l NITED STAT-Es- PATENT OFFICE.

JEAN B. Z. DUMAIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO EDGAR A. LORD,

OF SAME PLACE. I

PIPE-TH READING MACHINE.

SPECIFICATION forming part of Letters Patent No 477,406, dated June 21,1892.

' Application filed July 18, 1891. Serial No. 399,933. (No model.)

To all whom it may concern.-

Be it known that LJEAN B. Z. DUMAIS, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Pipe- ThreadingMachines, which are fully set forth in the following specification,reference being had to the accompanying drawings, in which Figure 1represents a plan view of a pipethreading machine embodying myinvention. Fig. 2 is a vertical longitudinal section taken on the line 22 of Fig. 1. Fig. 3 is a detail cross-section showing the die and theframe holding the die, taken on the line 8 3 of Fig. 1; and Fig. 4 is adetail cross-section of the die-holder detached, with the die removedfrom the same, taken on the line 44 of Fig. 1.

My invention relates to pipe-threading machines, and has for its objectthe construction of a machine for that purpose whereby the pipe which itis desired to thread may be threaded by a continuous and rapid movementof a screw-threading die on the circumference of the pipe; and myimprovement consists in the construction of a cage or frame adapted tohold the die and in suitable devices or methods whereby the cage orframe may be rotated with the die about a stationary pipe to bethreaded; and my invention consists in various other devices andimprovements, as hereinafter described.

Heretofore pipes have been threaded by a die fixed in the center of atwo-armed lever operated by hand, and the work was accomplished in aslow and laborious manner.

By myimproved machine the screw-threadin g die may be operated by anyapplied power and the work is rapidly and satisfactorily accomplished.All the parts are preferablyiron or steel.

In the drawings, A represents the bed of the machine, which may besecured to any suitable support. B represents the worm which actuatesthe gear C, with which it meshes. The worm Bis mounted in boxes I) b inthe bed of the machine. On one end of the shaft of the worm is mounted asmall gear-wheel D, adapted to mesh with and be operated by thegear-wheel E, which is mounted on the shaft F, which has its bearings inboxes f f in the bed of the machine. Theshaft F is actuated by a pulleyG, which may be driven by any suitable power. WVhenever it is desired tooperate the machine by hand, 5

secured on it a knob I, by which the spindle 6 may be turned, ashereinafter described.

K is a metal plate having on its inner end at its center a recess 7t,through which passes a screw L, which is screwed into the opening 2',formed in the inner end of the spindle I, as

shown in Fig. 2, the opening ibeing screwthreaded, so as to allow thescrew L to be screwed into it, by means of which the plate K and spindleI are removably secured to each other for the purposes hereinafter setforth.

M is a die rectangular or square in form, having in its center ascrew-threaded opening N, which may be of any size, so as to fit pipesof different diameters. threaded opening N may be entirely screwthreadedor itmay have four or more cuttingedges, with the remaining portions cutaway, as shown at m in Fig. 3, for the purpose of al- This screwlowingthe iron filings to fall away from the die. These dies are adapted to bescrewed onto the pipe to be threaded, as hereinafter described.

0 represents a pipe to be threaded, which is rigidly secured at or nearone end while the other end is being operated upon. This pipe may besecured by clamping-vise S, as shown in Fig. 1, or by any device forholding or clamping such pipes.

P is a cage rectangular or square, as shown 5 in Fig. 4, constructed,preferably, with openings in its sides for the purpose of allowing thechips from the pipe to .fall out of it. This cage P is open at one end,so that the plate K and the die M may be placed therein, both of theseparts being shaped to conform to the interior of the cage. The plate Kis pushed into the farther or closed end of the cage, where it issecured to the inner end of the spindle I, as already stated and as seenin Fig. 2 of the drawings. The die M is placed in the cage after theplate K and is pushed in nearly or quite to the latter. The die M isloose within the cage, so that it is free to move back and forth. Whenthe parts are thus arranged and the pipe is fixed with one end extendinginto the cage for threading, as seen in Fig. 2, the die M will notalways engage at first with the pipe without some assistance. The plateK is for this purpose, for, being fastened upon the end of the spindleI, which has some reciprocating motion, this plate may be pushed outwardagainst the die M, and so cause it to engage With the end of the pipe,after which it will, of course, travel along the cage toward the openend thereof as the thread is formed. The inner or closed end of the cageis removably secured to the journal 0' of the gear-wheel O by set-screws(1, as shown in Fig. 1.

The cage P, with the die M in it, revolves about the pipe to bethreaded, the die M moving in the cage toward the open end thereof asthe pipe 0 is being threaded by said die.

WVhenever it is desired to thread a pipe, the pipe is placed in a viseor clamping-machine, which rigidly holds it in position. The die M ispressed by the plate K and spindle I onto the pipe 0 until thecuttingthreads of N take hold of and begin to operate on the pipe 0.After the die has commenced threading the pipe the pressure of the plateK on the die is unnecessary, as the die in revolving feeds itself and isdrawn toward the open end of the cage. The worm B rotates the gear 0 andshaft C, and the plate K and die M are revolved 'in and by the cage P,which is rigidly secured to the journal C, with which the cage Prevolves.

Having thus described my invention, what I claim as new, and desire tosecure byLetters Patent, is-

1. In a pipe-threading machine,a revoluble cage or die-holder muchlonger than the thickness of the die and open at one end, in combinationwith a threading-die set loosely in said holder and free to slide backand forth therein lengthwise of the holder, and a pipesupport in whichthe pipe to be threaded is rigidly secured, whereby the die is turnedupon the end of the pipe by the revolution of the holder and at the sametime is automatically fed by moving forward bodily in the cage as thethread is cut on the pipe, substantially as described.

2. In a pipe-threading machine, the cage P, in combination with the dieM, plate K, and spindle I, substantially as described.

3. The spindle I, having a knob or handle I, and the plate K, incombination with the die IWI, substantially as shown and described.

4. In a pipe-threading machine, the worm B, gear-wheel O, journal 0, andcage P, rigidly secured to said journal, in combination with the die Hand plate K, substantially as shown as described.

5. In a pipe-threading machine, the pulley G, shaft F, gears E and D,worm B, gear-wheel C, and journal 0, in combination with the cage P,plate K, spindle I, and die M, substan-. tially as described.

6. The stud-pin II, gears E and D, worm B, gear-wheel C, journal C, andcage P, rigidly secured to said journal, in combination with the plateK, spindle I, knob I, and die M, substantially as shown and described.

JEAN B. Z. DUMAIS.

Witnesses:

ABBIE M. BEsT, H. H. TALCOTT.

